Catch UnknownSSHError and do not use return codes

The runners were still checking for the return codes of
create_ssh_master_connection instead of catching the exception.
We now catch the exceptions we calling the runners in main.

src/unisync/defaults.py

@@ -1,4 +1,4 @@
-# copyright (c) 2026 paul retourné
+# Copyright (c) 2026 paul retourné
 # spdx-license-identifier: gpl-3.0-or-later
 
 from pathlib import Path

src/unisync/errors.py

@@ -1,6 +1,9 @@
 # Copyright (C) 2025-2026 Paul Retourné
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+from typing import NoReturn
+import sys
+
 class RemoteMountedError(Exception):
     pass
 
@@ -12,3 +15,7 @@ class UnknownSSHError(Exception):
 
 class FatalSyncError(Exception):
     pass
+
+def unisync_exit_fatal(reason:str) -> NoReturn:
+    print(reason)
+    sys.exit(1)

src/unisync/main.py

@@ -4,6 +4,7 @@
 from pathlib import Path
 
 from unisync.argparser import create_argparser
+from unisync.errors import UnknownSSHError, unisync_exit_fatal
 from unisync.runners import unisync_sync, unisync_add, unisync_mount
 from unisync.config import load_config
 from unisync.synchroniser import Synchroniser
@@ -38,7 +39,10 @@ def main():
 
     paths_manager = PathsManager(Path(config.roots.local), config.other.cache_dir_path)
 
+    try:
         cli_args.func(synchroniser, paths_manager, config)
+    except UnknownSSHError:
+        unisync_exit_fatal("Connection failed quitting")
 
 
 if __name__ == "__main__":

src/unisync/paths.py

@@ -73,9 +73,9 @@ class PathsManager:
             try:
                 paths = self.user_select_files()
                 break
-            except subprocess.TimeoutExpired as e:
+            except subprocess.TimeoutExpired:
                 if input("Timeout expired do you want to retry (y/n): ") != "y":
-                    raise e
+                    raise
         self.write_new_paths(paths)
 
     def get_paths_to_sync(self) -> list[str]:

src/unisync/runners.py

@@ -5,11 +5,11 @@ from unisync.synchroniser import Synchroniser
 from unisync.paths import PathsManager
 from unisync.config import Config
 
+
 def unisync_sync(synchroniser:Synchroniser, paths_manager:PathsManager, config: Config):
     del config # The function signature must be the same for all runners
-    if synchroniser.create_ssh_master_connection() != 0:
-        print("Connection failed quitting")
-        return 1
+
+    synchroniser.create_ssh_master_connection()
     print("Connected to the remote.")
 
     synchroniser.sync_files(paths_manager.get_paths_to_sync())
@@ -24,9 +24,8 @@ def unisync_sync(synchroniser:Synchroniser, paths_manager:PathsManager, config:
 
 def unisync_add(synchroniser:Synchroniser, paths_manager:PathsManager, config: Config):
     del config # The function signature must be the same for all runners
-    if synchroniser.create_ssh_master_connection() != 0:
-        print("Connection failed quitting")
-        return 1
+
+    synchroniser.create_ssh_master_connection()
     print("Connected to the remote.")
 
     # TODO config or cli to skip this first sync